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Have you seen Building Bloqs?
It has PAYG workspaces where you could use an industrial sewing machine, though I'm not sure about on site storage. You only need to pay when you use it and the cafe is really good.
I know it's a shared space and that's not what you wanted, but it looks like you went for black Omniums in the end so you never know...
Also it's right by the river so you could drive to work.
still looking for silver omniums
also looking for a studio space/workspace that would fit an industrial sewing machine (preferably not a shared space but negotiable) for a reasonable ppm